Antonietta? from Japan

February 17, 2000
From: Yasuhiro Shirai

Dear Bill,
Thank you for your reply to my last question. I found this opisthobranch at Shima. This opisthobranch crawled on rock with seaweed like my photo.
Could you please identify this animal for me.

Location: Shima Pref. Mie Japan (Kii Peninsula east coast)
Length: 5mm
Water temperature: 13C
Date Jan. 2000
Depth: 3m
Crawling on rock

Best regards,
Yasuhiro Shirai

Shirai, Y., 2000 (Feb 17) Antonietta? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

[Note added April 29 2005: See message #13442 suggesting this may be Favorinus perfoliatus]

Dear Yasuhiro,
I'm not sure of this one but I wonder if it is a colour form of Favorinus mirabilis. It has the dark spot on the cerata and black perfoliate rhinophores like that species but without an idea of its anatomy it could easily be something else.
Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Feb 17). Comment on Antonietta? from Japan by Yasuhiro Shirai. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Related messages

  1. Yasuhiro's Favorinus mirabilis
    From: Atsushi Ono, April 30, 2005
  2. Re: Antonietta? from Japan
    From: Yasuhiro Shirai, March 18, 2000

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